TB20 user guide
F-8003-4496-02-A
TB20 quadrature trigger box
Quadrature trigger box
Legal information
Disclaimer and warranty information
Disclaimer
Renishaw has made considerable efforts to ensure the content of this document
is correct at the date of publication but makes no warranties or representations
regarding the content. Renishaw excludes liability, howsoever arising, for any
inaccuracies in this document.
Renishaw reserves the right to make changes to this document and to the product
described herein without obligation to notify any person of such changes.
Warranty
Equipment requiring attention under warranty must be returned to your equipment
supplier.
Unless otherwise specifically agreed in writing between you and Renishaw, if you
purchased the equipment from a Renishaw company, the warranty provisions
contained in Renishaw’s CONDITIONS OF SALE apply. You should consult these
conditions in order to find out the details of your warranty but, in summary, the
main exclusions from the warranty are if the equipment has been:
• neglected, mishandled or inappropriately used; or
• modified or altered in any way except with the prior written agreement of
Renishaw.
If you purchased the equipment from any other supplier, you should contact them
to find out what repairs are covered by their warranty.
Trade marks
RENISHAW and the probe symbol used in the RENISHAW logo are registered
trade marks of Renishaw plc in the United Kingdom and other countries.
apply innovation and names and designations of other Renishaw products and
technologies are trade marks of Renishaw plc or its subsidiaries.
All other brand names and product names used in this document are trade
names, trade marks, or registered trade marks of their respective owners.
Copyright
© 2017-2021 Renishaw. All rights reserved.
This document may not be copied or reproduced in whole or in part, or transferred
to any other media or language, by any means without the prior written
permission of Renishaw. The publication of material within this document does not
imply freedom from the patent rights of Renishaw plc.
Renishaw part no: F-8003-4496-02-A
First issued: 01-2021
Quadrature trigger box
Legal information
International regulations and conformance
EC compliance
Renishaw plc declares that the TB20 quadrature trigger box complies with the
applicable standard and regulations.
Renishaw plc hereby declares that the TB20 quadrature trigger box is in
compliance with the essential requirements and other relevant provisions of
Directive 1999/5/EC.
Contact Renishaw plc or visit
http://www.renishaw.com/en/certification--38812
for the full EC declaration of conformity.
WEEE
The use of this symbol on Renishaw products and/or
accompanying documentation indicates that the product should
not be mixed with general household waste upon disposal. It is
the responsibility of the end user to dispose of this product at
a designated collection point for waste electrical and electronic
equipment (WEEE) to enable reuse or recycling. Correct
disposal of this product will help to save valuable resources and
prevent potential negative effects on the environment. For more
information, please contact your local waste disposal service or
Renishaw distributor.
RoHS compliance
Compliant with EC directive 2011/65/EU (RoHS).
Packing material information
Packaging
component
Material ISO 11469
Recycling
guidance
Outer box
Cardboard Not applicable Recyclable
Polypropylene PP Recyclable
Loose form packing Maize starch Not applicable Recyclable
Bags
Low density polyethylene LDPE Recyclable
Metalised polyethylene PE
Not currently
recyclable
Quadrature trigger box
Contents
Legal information ...................................................2
Disclaimer and warranty information ................... 2
Disclaimer ........................................................... 2
Warranty .............................................................. 2
Trade marks ........................................................ 2
Copyright ............................................................. 2
International regulations and conformance ......... 3
EC compliance .................................................... 3
WEEE .................................................................. 3
Safety information ..................................................5
General safety information .................................. 5
Safety labelling .......................................................6
Mechanical safety ...................................................7
Electrical and power safety ...................................7
What is TB20? .........................................................8
TB20 kit components .............................................9
TB20 interface ....................................................... 10
TB20 configurations ............................................. 11
Test overview ........................................................12
TB20 set-up ...........................................................13
Trigger interval set-up ..........................................14
Switch set-up ........................................................16
Data capture .......................................................... 17
Data capture reset button ....................................18
Quasi-static data capture using
CARTO Capture ....................................................19
Dynamic data capture using LaserXL
dynamic measurement ......................................... 20
Data analysis ......................................................... 21
Diagnostics ...........................................................22
Power LED ........................................................ 22
Status LED ........................................................ 23
System specifications .......................................... 24
Encoder types supported ....................................25
Environment .......................................................... 26
Maximum velocities .............................................. 26
Weights and dimensions .....................................27
Appendix A ............................................................28
Wiring ................................................................ 28
Appendix B ............................................................29
Accuracy ........................................................... 29
Delays in open loop ........................................... 29
Accuracy - Delays in closed loop ...................... 30
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Quadrature trigger box
Safety information
Ensure that you read and understand the TB20 user guide
before using any TB20.
The TB20 can be used in a variety of environments and applications. To ensure
the safety of the user and other personnel in the vicinity it is therefore paramount
that a comprehensive risk assessment is carried out for the machine under test
before using the TB20. This should be carried out by qualified users (requiring
machine competency, applicable technical knowledge and a trained risk assessor)
with consideration for the safety of all personnel. The risks identified must be
mitigated prior to using the product. The risk assessment should pay particular
attention to machine, manual handling, mechanical, laser, electrical and power.
General safety information
The TB20 quadrature trigger box is designed for integration into the primary
position feedback loop of a motion system. It is essential that the system is
installed in accordance with the instructions in the installation manuals and it is
the responsibility of the system integrator to ensure that, in the event of a failure of
any part of the TB20, the motion system remains safe.
In motion systems with powers or speeds capable of causing injury, safety
protection measures must be included in the design. It is recommended that
satisfactory operation of these protection measures is verified before the feedback
loop is closed. The following safety protection measures should be used. For
closed loop operation it is the sole responsibility of the system integrator to select
appropriate measures for their application.
1. The axis must include physical limit switches which, when tripped, will stop
axis motion before damage occurs (soft limits alone are insufficient). Note
that in the case of thermally compensated systems, positional corrections of
several hundred ppm are possible. This should be taken into account when
defining the relative positions of soft and hard axis limits.
2. Cable breakage detection (encoder disconnect). The position feedback is
provided as differential line driven pairs. Failure in the cable or of the line
drivers can be detected by checking these differential pairs are always being
driven in opposing states. If the lines are not in opposing states, the motion
must be stopped.
3. Motor torque monitoring. If the motor torque exceeds an expected limit, the
axis of motion must be stopped.
4. The machine must include an emergency stop button.
5. Following error detection. If the difference between the controller demand
position and the axis feedback position exceeds an expected limit, the axis
motion must be stopped.
6. Guards, viewing windows, covers and interlocks may be used to prevent user
access to hazardous areas, and to contain ejected parts or materials.
7. If the machine includes an independent tacho (velocity) feedback system,
this should be cross-checked with the position feedback. For example, if the
tacho indicates the axis is moving, but the position feedback doesn’t, the axis
motion must be stopped.
Note: In the case of measures 5 to 7, the limits need to be selected
carefully depending on the application and the type of position
compensation selected to avoid false alarms.
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Quadrature trigger box
There are no user-serviceable parts inside the TB20.
Do not remove any part of the housing.
Ensure that you read and understand the TB20 user guide before
using any TB20.
THE DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS
SUBJECT TO THE FOLLOWING CONDITIONS: (1)THIS DEVICE MAY CAUSE
HARMFUL INTERFERANCE. (2)THIS DEVICE MUST ACCEPT ANY INTERFERENCE
RECEIVED. INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED
OPERATIONS.
Safety labelling
7
Quadrature trigger box
Mechanical safety
• Beware of trip hazards that may be created when using the TB20 in
conjunction with other systems. e.g. due to trailing cables.
• Exercise caution if components are to be mounted to moving or rotating
machinery. Beware of cables becoming entangled.
• Exercise extreme caution if system components are to be mounted to
machinery that may accelerate rapidly or move at high speed, which could
lead to items colliding or being ejected.
• If it is necessary to operate the machine with the guards or any safety feature
removed or disabled, it is the responsibility of the operator to ensure that
alternative safety measures are taken in line with the machine manufacturer’s
operating instructions or relevant codes of practice.
• If you are using a part program or error correction parameters generated by
the Renishaw software, it is the responsibility of the user to validate these
at low feedrate and be prepared to operate the emergency stop button if
necessary.
Electrical and power safety
• The TB20 has been qualified for use with the power supply cable and the
plug adaptor kit supplied with the system. A specification for the power
supply requirements can be found here.
• In the event of damage to the power adaptor, all power must be isolated from
the equipment before any other action is taken.
• Never connect the system to devices not intended to be used with the TB20.
8
Quadrature trigger box
What is TB20?
TB20 is an interface which is used with Renishaw’s XL laser calibration system.
TB20 reads output from an encoder and generates a trigger for the laser system
at predetermined intervals. Typical uses are leadscrew calibration and motion
control set-up.
The basic operation principle is:
• TB20 receives quadrature input pulses from an encoder system.
• For every ‘Nth’ input pulse it generates a TPin trigger
(N is defined by the user).
• The XL laser records the laser reading when the TPin trigger is received.
• TB20 can regenerate the original quadrature pulses for the controller so the
servo loop is not broken.
Note: For information on delay durations for signal regeneration at the
controller port and for trigger generation refer to Appendix.
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Quadrature trigger box
1
TB20 trigger box
2
XL trigger cable
3
Power supply cable
4
Plug adaptor kit
5
TB20 encoder and controller
port connectors
6
Calibration user guide card
TB20 kit components
1
4
3
2
5
Laser calibration user guides can be found at:
Benutzerhandbücher zur Laserkalibrierung finden Sie unter:
レーザー計測ユーザーガイドは、次のサイトをご覧ください：
雷射校准使用指南位於：
激光校准使用指南可从雷尼绍网站下载：
Las guías de usuario de calibración se pueden encontrar en:
레이저 캘리브레이션 사용자 안내서가 제공되는 웹 페이지:
www.renishaw.com/caluserguides
M-9904-4443-01-A
Laser calibration user guides
EN
DE
JA
ZH-TW
ZH
ES
KO
6
13
Quadrature trigger box
Connect the USB power supply to the electrical outlet
TB20 set-up
Configure switch settings
Note: for TB20 encoder and controller port pin-outs refer to Appendix A.
Connect the trigger port on TB20 to auxillary I/O
connector on the XL laser
Connect the controller to the controller port (if required)
Connect the encoder to the encoder port
Connect the USB power supply cable to TB20
14
Quadrature trigger box
Trigger interval set-up
To configure the trigger interval on the TB20 the ‘trigger interval’ switch is used. The input is a decimal value (“00000” is not permitted).
The values for this switch can be set by reference to the table below or by calculation on the following page.
Encoder resolution 5 µm 1 µm 0.5 µm 0.1 µm
Trigger interval TB20 setting Step size TB20 settings Step size TB20 settings Step size TB20 settings
10 µm 00001 2 µm 00001 1 µm 00001 0.2 µm 00001
30 µm 00003 6 µm 00003 3 µm 00003 0.6 µm 00003
50 µm 00005 10 µm 00005 5 µm 00005 1 µm 00005
100 µm 00010 20 µm 00010 10 µm 00010 2 µm 00010
300 µm 00030 60 µm 00030 30 µm 00030 6 µm 00030
500 µm 00050 100 µm 00050 50 µm 00050 10 µm 00050
1 mm 00100 200 µm 00100 100µm 00100 20 µm 00100
3 mm 00300 600 µm 00300 300 µm 00300 60 µm 00300
5 mm 00500 1 mm 00500 500 µm 00500 100 µm 00500
10 mm 01000 2 mm 01000 1 mm 01000 200 µm 01000
30 mm 03000 6 mm 03000 3 mm 03000 600 µm 03000
50 mm 05000 10 mm 05000 5 mm 05000 1 mm 05000
100 mm 10000 20 mm 10000 10 mm 10000 2 mm 10000
60 mm 25000 30 mm 25000 6 mm 25000
100 mm 50000 50 mm 50000 10 mm 50000
15
Quadrature trigger box
Trigger interval set-up
For custom trigger interval use the calculation:
Where the encoder resolution is defined as:
Signal period
Resolution
Backwards
Forwards
AQUAD
BQUAD
Forwards Backwards
A
B
Resolution
Pitch
Cosine
Sine
1 Vpp
2.5 V DC offset
RS422 digital quadrature
Analogue quadrature
desired trigger interval (microns)
2 × encoder resolution (microns)
TB20 setting (in decimal) =
16
Quadrature trigger box
Switch number 1 2 3 4 5 6,7,8
Function Trigger direction Encoder type Encoder type Trigger period
Reserved
ON Bidirectional Backwards Analogue encoder 10 µA analogue Long (1 ms ± 1%)*
N/A
OFF Unidirectional Forwards Digital encoder 1 Vpp analogue Short (10 µs ± 1%)*
* This setting suits connectivity with XL laser and should be interfaced to the fast trigger input on the auxiliary I/O connector on the XL laser.
ON
OFF
Switch set-up
The TB20 must be configured to specify the type of encoder connected and the type of trigger required. This is achieved using the ‘configuration switches’.
17
Quadrature trigger box
Data capture
Two types of data capture can be achieved with TB20 using the XL-80 TPin function:
• Quasi-static – the bed moves via predefined intervals and stops for the measurement to be taken
• Dynamic – the bed moves continuously and TB20 triggers measurements to be taken
It is recommended to perform the quasi-static data capture using CARTO Capture, whereas dynamic data capture will require LaserXL software.
Note: For full details on TPin please refer to the CARTO or Laser XL user guide.
CARTO Capture software Laser XL software
18
Quadrature trigger box
Data capture reset button
The ‘RESET’ button provides the following functionality:
• Datum and capture the first point at the beginning of a test.
• Clear any error conditions logged by the TB20 (providing the source of the error has been removed).
• Update any changes to switch configurations.
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